I am traveling on business in China now, and when I use vpn to visit Youtube, there are always loading, and sometimes even failing to access. I have tried several vpn without anyimprovement; do you have any good recommendation?

Youtube will not optimize users’ visit to some country, I think the key point is the vpn server by your choice. If you are in Asia, the server located in west of US will be much better. I am using the product on popvpn.com, which has the server located in Los Angeles, and you can have a try.